linux-kernel - [PATCH 1/2] perf/ring_buffer: Modify the parameter type of perf_mmap_free

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Date:   Fri, 27 Sep 2019 16:22:44 +0800
From:   Yunfeng Ye <yeyunfeng@...wei.com>
To:     <peterz@...radead.org>, <mingo@...hat.com>, <acme@...nel.org>,
        <mark.rutland@....com>, <alexander.shishkin@...ux.intel.com>,
        <jolsa@...hat.co>, <namhyung@...nel.org>
CC:     <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/2] perf/ring_buffer: Modify the parameter type of
 perf_mmap_free_page()

In perf_mmap_free_page(), the unsigned long type is converted to the
pointer type, but where the call is made, the pointer type is converted
to the unsigned long type. There is no need to do these operations.

Modify the parameter type of perf_mmap_free_page() to pointer type.

Signed-off-by: Yunfeng Ye <yeyunfeng@...wei.com>
---
 kernel/events/ring_buffer.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c
index ffb59a4..abc145c 100644
--- a/kernel/events/ring_buffer.c
+++ b/kernel/events/ring_buffer.c
@@ -799,9 +799,9 @@ struct ring_buffer *rb_alloc(int nr_pages, long watermark, int cpu, int flags)
 	return NULL;
 }

-static void perf_mmap_free_page(unsigned long addr)
+static void perf_mmap_free_page(void *addr)
 {
-	struct page *page = virt_to_page((void *)addr);
+	struct page *page = virt_to_page(addr);

 	page->mapping = NULL;
 	__free_page(page);
@@ -811,9 +811,9 @@ void rb_free(struct ring_buffer *rb)
 {
 	int i;

-	perf_mmap_free_page((unsigned long)rb->user_page);
+	perf_mmap_free_page(rb->user_page);
 	for (i = 0; i < rb->nr_pages; i++)
-		perf_mmap_free_page((unsigned long)rb->data_pages[i]);
+		perf_mmap_free_page(rb->data_pages[i]);
 	kfree(rb);
 }

-- 
2.7.4